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Vol.38, No.8, 1075 ~ 1084, 2000
Title
Macroscopic Heat Transfer Model in Electric Arc Spray Forming of Low Carbon Steel Ring
석현광Hyun Kwang Seok,이재철Jae Chul Lee,Patrick S . Grant,이호인Ho In Lee
Abstract
Critical to the electric arc spray forming(EASF) including Osprey forming and plasma spray forming is the thermal condition of the deposit, which determines the microstructure and mechanical properties of the deposits. In the EASF of Fe-0.06%C steel ring, the microhardness of the deposit varied in the range from 160 through 230 Hv(0.2) with various EASF conditions. It was found out that the microhardness of the deposit was closely connected with the thermal condition of the deposit. Temperature profiles in an EAS formed ring of low carbon steel(Fe-0.06%C) has been calculated by using a growth model based on the vector calculus and heat transfer model based on the body fitted coordinate method. The effects of EASF parameters such as substrate rotation velocity, droplet flow rate and average droplet temperature on the preform temperature profile were investigated. The calculation results were compared with experimentals. Fe-0.06%C steel was arc-melted and sprayed onto a rotating tubular steel substrate. During spray forming, the surface temperature of the deposit was measured using an infrared thermal imaging camera that was accurately calibrated. The effect of deposition temperature on the deposit microstructure was also investigated. The calculation results showed a good agreement with experimental results.
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